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Etude expérimentale et modélisation des écoulements diphasiques et de la dispersion dans des fractures rugueuses réelles

Abstract : The two-phase flows through fractures occur in many industrial and environmental processes.Modelling these flows needs understanding the role of geometric characteristics of the fractures surfaces. The objective of this thesis is to study experimentally the two-phase flow and the dispersion of tracers in fractures which the aperture map is known and propose a suitable model.The inertial two-phase flow model is based on the generalization of the single-phase full cubiclaw that accounts for non-Darcian effects by using the F function approach. On this approach,the presence of a second fluid is taken into account through a multiplier function introduced into the superficial velocity of each fluid. This model let us predict the relative permeability and the saturation as a function of the two fluid flows with two adjustment parameters.The concentration profiles obtained during dispersion experiments were interpreted with different models to study their ability to describe the dispersion in fractures and hence the heterogeneity of them. The results show that the classical convection-dispersion is not appropriate due to the heterogeneity of the fractures. On the other hand, the stratified model,with only one estimated parameter, gives satisfactory results and allows quantifying heterogeneity. Finally, with five estimated parameters, from the concentration curve at the outlet of the fractures, the CTRW model can describe the concentration profiles of all abscissas with good accuracy
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Submitted on : Thursday, March 29, 2018 - 11:50:12 AM
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Ali Nowamooz. Etude expérimentale et modélisation des écoulements diphasiques et de la dispersion dans des fractures rugueuses réelles. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL007N⟩. ⟨tel-01748820⟩



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